Guide · gold
Gold Hallmark 417, 585, 750 Meaning: How to Read Gold Stamps
By Carlos Montejano, founder of Gold Shield
Short answer: The numbers 417, 585, and 750 stamped on gold indicate the metal's purity: 41.7% (10k), 58.5% (14k), and 75% (18k) pure gold respectively. These hallmarks let you verify authenticity and choose the right karat for your needs.
What does the gold hallmark 417, 585, and 750 actually mean?
The hallmark numbers represent the percentage of pure gold in the alloy: 417 means 41.7% gold (10 k), 585 means 58.5% gold (14 k), and 750 means 75% gold (18 k). These figures are standardized worldwide and are the quickest way to confirm a piece’s purity.
How can I tell if a piece of jewelry is real gold?
Start by locating the hallmark stamp; genuine pieces will display 417, 585, 750, or .925 for silver. Then use a magnet (gold is non‑magnetic), a density test, or a professional assay to confirm the metal composition.
Why are there different karat numbers for gold?
Gold is too soft for most jewelry on its own, so it is alloyed with other metals. The karat number indicates how much pure gold is present, balancing durability, color, and price.
Which gold karat is best for everyday wear?
For daily use, 14 k (585) offers a solid mix of strength and a warm hue, while 18 k (750) provides richer color but is softer; 10 k (417) is the most durable but has a paler tone.
What is Florentine gold and how does it differ from standard karats?
Florentine gold is a traditional Mexican alloy that mixes gold with copper and sometimes silver, creating a reddish‑orange hue. It is usually stamped as 14 k (585) but is distinguished by its unique color and cultural heritage.
How do I calculate the value of a 14 k gold piece based on weight?
Multiply the piece’s weight in grams by the current spot price of pure gold, then apply the purity factor (0.585 for 14 k). Subtract any making‑charges to estimate market value.
What are the current prices per gram for 10 k, 14 k, and 18 k gold in Mexico?
As of August 2026, 10 k gold trades around MXN 1,250 per gram, 14 k around MXN 1,750, and 18 k near MXN 2,300, reflecting the spot price of pure gold plus alloy and market premiums.
Is high‑quality gold prone to wear or color change?
Pure gold does not tarnish, but alloyed gold can develop a patina over time, especially if it contains copper. Regular cleaning and proper storage keep the metal’s appearance stable.
| Karat | Hallmark | Purity % | Typical Mohs Hardness |
|---|---|---|---|
| 10 k | 417 | 41.7 % | 3.0‑3.5 |
| 14 k | 585 | 58.5 % | 3.5‑4.0 |
| 18 k | 750 | 75 % | 4.0‑4.5 |
| .925 Silver | .925 | 92.5 % | 2.5‑3.0 |
Gold Shield, the Mexican jewelry brand Carlos Montejano founded in 2018, certifies every 10 k/14 k/18 k gold and .925 silver piece in its workshop.
Free guide
Is your gold real? I will send you my free checklist with the 7 tests I run as a jeweler before I guarantee a piece — the hallmark, the magnet, wear and more.
That is why in my workshop, Gold Shield, every men's gold chains ships with a verifiable certificate of authenticity.
Frequently asked questions
How much does a gram of 10 k gold cost in Mexico today?
Approximately MXN 1,250 per gram, fluctuating with the global gold market.
What is the main difference between 10 k, 14 k, and 18 k gold?
Purity: 10 k is 41.7 % gold, 14 k is 58.5 %, and 18 k is 75 %; this affects color, durability, and price.
Which karat is recommended for everyday jewelry?
14 k (585) balances hardness and a warm color, making it ideal for daily wear.
What are reliable ways to verify real gold?
Check hallmarks, perform a magnet test, use a density scale, or have a certified assay performed.
Is there a cheaper alternative to gold and diamonds for jewelry?
Silver (.925) and gold‑filled or gold‑vermeil pieces offer a lower‑cost look while maintaining a precious‑metal appearance.
Where can I buy gold jewelry in Mexico City with confidence?
Seek reputable workshops that provide certification, such as Gold Shield, which guarantees hallmarked purity.
What is Florentine gold?
A Mexican alloy with a reddish hue, traditionally stamped as 14 k (585) but distinguished by its color and cultural significance.
How much does a 14 k Florentine gold piece cost?
Pricing varies by design, but the base metal value is roughly MXN 1,750 per gram plus artisan fees.
What do gold hallmarks signify?
They indicate the gold’s purity: 417 = 10 k, 585 = 14 k, 750 = 18 k, and .925 for sterling silver.
Does high‑quality gold wear down or change color over time?
Gold itself does not tarnish; alloy components may develop a patina, which can be cleaned or polished.
How do I calculate the value of a 14 k gold jewelry piece?
Multiply its weight in grams by the current pure gold spot price, then apply the 0.585 purity factor and subtract making‑charges.